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What else can I help you with?
What is 4.8 x 1x104?
499.2
What is a good sentence with the words electromagnetic spectrum in it?
The electromagnetic spectrum spans from the lowly radio signals (1x104 Hz) that we use for terrestrial broadcasting to gamma rays (1x1021 Hz) from the sun! ===================
How many atoms are you made of?
Taking the top 5 elements in the body, their % of the body's mass (assumed to be 70 kg) we can calculate the number of moles of each in the body: Element: Percent by mass: Grans per body: Moles per body for 70 kg Oxygen: 65: 45000: 3000 Carbon:18: 12600: 1050 Hydrogen: 10: 7000: 7000 Nitrogen: 3: 2100: 175 Calcium: 1.5: 1950: 54 Giving a total number of moles as 11280 = 1x104 (more or less) And knowing the number of atoms per mole (Avogadro's number) = 6.03 x1023 Number of atoms in a body is around 6.03 x1027
How do you calculate a lux level in a room?
Light Level or Illuminance, is the total luminous flux incident on a surface, per unit area. The work plane is where the most important tasks in the room or space are performed.Measuring Units Light Level - IlluminanceIllumenance is measured in foot candles (ftcd, fc, fcd) (or lux in the metric SI system). A foot candle is actually one lumen of light density per square foot, one lux is one lumen per square meter. 1 lux = 0.0929 foot candle = 1 lumen /sq meter = 0.0001 phot1 ftcd = 1 lux / 10.7521 lumen/sq ft = 1 foot candle = 1x104 lux = 1 phot
What is the difference between shelf life and half life?
An isotope of a chemical element is an atom that has the same number of protons (this also means this atom has the same atomic number) and electrons, but has a different numbers on neutrons. The isotope is radioactive if it has too many neutrons in the nucleus and because of this the isotope is unstable. The half-life of a radioactive isotope is a time period. When the isotope is at the end of the period it's weight will be the half of the starter weight.
What is an easy way to understand solar energy?
Please see the related link about the energy band theory. It is easier to understand semiconductor operations with the concept. At room temperature (20 degrees Centigrade) or higher (the sun's radiation will warm up the earth and everything in the sun), some electrons, but not enough, will be roaming in the conduction band of the solar cell, made of silicon mostly, or other III-V or II-V semiconducting compounds. Each material has a distinct band gap (Si: 1.1eV), the forbidden energy zone, that an electron in the valence band has to cross/overcome in order to be in the conduction band. What can excite an valence electron (what can supply sufficient energy) to the conduction band? The answer is photons. When a photon is absorbed in a semiconductor, the photon releases its energy to the lattice as heat or to the electrons. Photons also have a second personality, a behavior that is best described as an electromagnetic wave (see the related link about EM spectrum), which encompasses a wave with frequency ranging from 1x104 to 1x1021 [Hz]. The sun is a good source of EM waves (see the related link about the sunlight), the visible part of which spans from 400 nm to 700 nm in wavelength. We can convert frequency to wavelength to energy for photons/light. They are interchangeable here. wavelength = c / f, where c = the speed of light = 3x108 [m/s]; f = frequency [Hz] energy = h * frequency, where h = the Planck constant = 6.626 068 96(33) × 10−34[J s]. Fortunately, we also have a visual aid (see the table in the EM spectrum link). All we need to know is do we have photons of enough energy to overcome at least 1.1eV of the energy gap? According to the table, we need a wave of wavelength less than about 1x10-6 [m], which is, viola, within the range of visible light. Conclusion: the sun provides the photons needed to excite valence electrons to the conduction band of a semiconductor. Once the electron is in the conduction band, it is free to roam. With the aid of an electric field (by applying a voltage across two terminals), you have electron flow in the closed circuit (electricity). P.S. The business of solar cell remains to be how to increase the conversion efficiency (different materials, reflective coating, sun-tracking, etc) without incurring too much cost. (See the related link about solar cells).
What does SI prefix mean?
i know this is stupid, but that's why i remember it tera giga mega kilo hecto deka deci centi milli micro nano pico femto atto Right? k well i say the giant mom killed her dumb doctor cause. and then i remember the alphabet hijkl M N o P... Micro Nano Pico. and then just idk the last two.. femto atto, you'll just actually have to remember those. hope that helped lol
